These are the lights to properly guide a player's fingerprints in the LEDs and to learn the music of this freight zilot system for bass.

Add this paper-thin LED strip to your bass and rock out the lights. This Freight Zealot for bass guitar has now become a reality.

source of images gif - https://laughingsquid.com/fret-zealot-for-bass-a-music-learning-system-that-uses-led-lights-to-properly-guide-a-players-fingers/